package com.itheima.reggie.controller;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.*;


import java.time.LocalDateTime;
import java.util.List;

/**
 * <p>
 * 购物车 前端控制器
 * </p>
 *
 * @author 黑马程序员
 * @since 2022-06-06
 */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;


    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if(dishId != null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);

        }else{
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if(cartServiceOne != null){
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            cartServiceOne = shoppingCart;
            cartServiceOne.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);

        }

        return R.success(cartServiceOne);
    }
    @GetMapping("/list")
    public R<List<ShoppingCart>> seleceList(){
        log.info("数据为{}");
        LambdaQueryWrapper<ShoppingCart> qw=new LambdaQueryWrapper<>();
        qw.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        qw.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(qw);
        return R.success(list);
    }

    @PostMapping("/sub")
    public R<ShoppingCart> reduce(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);
        //先得到当前用户id，获取当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> qw =new LambdaQueryWrapper<>();
        qw.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        qw.orderByAsc(ShoppingCart::getCreateTime);
        Long dishId = shoppingCart.getDishId();
        if(dishId != null){
            //添加到购物车的是菜品
            qw.eq(ShoppingCart::getDishId,dishId);

        }else{
            //添加到购物车的是套餐
            qw.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(qw);
        if (cartServiceOne !=null){
            Integer number = cartServiceOne.getNumber();
            if (number>1){
                cartServiceOne.setNumber(number-1);
                shoppingCartService.updateById(cartServiceOne);
            }else {
                shoppingCartService.remove(qw);
            }
            }else {
            shoppingCartService.remove(qw);
        }


        return  R.success(cartServiceOne);
    }

    @DeleteMapping("/clean")
    public R<String> cleanGwc(){

        //先得到当前用户id，获取当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> qw =new LambdaQueryWrapper<>();
        qw.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        qw.orderByAsc(ShoppingCart::getCreateTime);

        shoppingCartService.remove(qw);
        return R.success("删除成功");
    }

}

